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Hoshizaki rh1-aac Manual Suplementar

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19
Problem
Possible Cause
Remedy
[5] Cabinet temperature 
too high.
a) Setpoint
1. Incorrect.
1. Correct setpoint. See 
"II.B.1.b) Temperature 
Setpoint." 
b) Door
1. Not sealing, or open for 
long intervals.
1. Check for sealing, check for 
door open at time of warm 
cabinet temperature.
c) Defrost
1. Not enough defrosts 
occurring per day.  
Operation in humid 
conditions.
1. See "II.B.1.c) Defrost."
d) Refrigerant
1. Leak.
1. Repair leak and recharge.
e) Fan Motor 
1. Defective.
1. Check and replace.
f) Air Filter
1. Clogged.
1. Clean.
g) Condenser
1. Dirty.
1. Clean.
h) Thermistor
1. Defective.
1. See "II.C. Thermistors." 
Check and replace.
i) Control Module
1. Defective.
1. Replace.
[6] Cabinet temperature 
display indicator does 
not illuminate properly.
a) Control Module
1. Defective.
1. Replace.
[7] Cabinet temperature 
too low.
a) Thermistor 
1. Defective.
1. See "II.C. Thermistors." 
Check and replace.
b) Compressor Relay
1. Defective; contacts 
welded.
1. Replace.
c) Control Module
1. Defective.
1. Replace.
[8] Evaporator does 
not defrost completely.
a) Defrost Thermistor 
1. Defective.
1. See "II.C. Thermistors." 
Check and replace.
b) Defrost
1. Not enough defrosts 
occurring per day.  
Operation in humid 
conditions.
1. See "II.B.1.c) Defrost."
c) Defrost Heaters
(freezers only)
1. Defective.
1. Replace heaters.
d) Safety Defrost 
Thermostat 
(freezers only)
1. Defective, turning off 
heaters prematurely, or 
fused open.
1. Replace safety defrost 
thermostat.
[9] Defrost cycle  
lasts too long.
a) Defrost Thermistor 
1. Defective.
1. Replace.
b) Control Module.
1. Defective.
1. Replace.
c) Defrost
1. Not enough defrosts 
occurring per day.  
Operation in humid 
conditions.
1. See "II.B.1.c) Defrost."
d) Defrost Heaters.
(freezers only)
1. Defective.
1. Replace heaters.
e) Safety Defrost 
Thermostat 
(freezers only)
1. Defective, turning off 
heaters prematurely, or 
fused open.
1. Replace safety defrost 
thermostat.